Time-limit dash-pot.



TATBNTED MAY 22, -1906.l

M 'l vhm/emmf william Brpfrn 25 i provided with an automatic circuit-breaker UNITED l STATES WILLIAM B. Porriim, OF SOHENEOTADY, NEW YORK, ASSIGNOR To GENT .CORPORATION or Naw YORK,

' -fnRAL LELECTRIC OOMPAisIY, A

.PATENT sonni:Oia,u I

' Specification of Ii'etters Patent;

4 patented lnicayez, 1906.

Applets@ nea Juiy 25, 190s. suini Naf 186,999.-

To all whom) t 1 n,a,y concern: l

le it known that I, WILLIAM B. POTTER, a' citizen of the United States, residing at Schenectady, in the county of Schenectady and State of New York, have invented certain new and .useful Improvements in Time- ,which mig the apparatus. For instance, wherefseve'ral/ generatorslare used,it istcustomary to connectsaid generators 1n parallel 'tobusbarscommon to all, irorn which feedercircuits are led out to various parts of the system; Bei

' tween each generator and the busgbars 'isf'iii terposed an, automatic circuit-breaker rei sponsivetoan overload on lthat ps trticulai--` generator. So, also, each feeder-circuitis responsive toan overload on that particular circuit. Incase of an overload on one of the v L lfeeder-circuits it is desirable to check the ond or two until after the feeder-breaker has opening of the generator-breakers for a secopened, because if the excessiveload be rejther feeders.

I noved by the opening of the feeder-breaker y l .this leaves the tardily-operating generator-l 1- es vbreakers closed and the machines still con fnected'with thel bus-bars and supplying the Ifno retarding device 1s used, all the generator-breakers are liable-,to/, "n eedr at the same time that'any one o1- the `breakers opens, and rso cut olf the station and shutdown the whole system.

My invention hasespecial 'reference' to an improved time-limitorretarding device for though, it is applicable to relafslwitches orotheiz` forms of cir@ Y l fmovable iabutm preferabl a vibrating 'blade`oontaining'- a hole contro led Projecting normally supporting 5 armature of thefoverlad-magnet of an automaticcircuitbreakerofstandardform. When /feelyfin'one directhe magnet is energized, the. plunger is depressed, forcing the blade to swing through the liquid in the dash-pot until the plunger movement While actuating the dash-pot and freedofnfor ui'ck unobstructed action independentbf t e dashpot after expiration` of the time for which it is set. An action of this kkindiis essential in' operating' an automatic circuit-breaker, as the momentum of the'tripping-armature is necessar'v to overcome the ricti on ofthe locking mechanism. Itis also desirable in circuitclosersito prevent burnthe contacts by a slow approach.'A For around t e blade, the opening`in which can V'be regulated by an adjusting-screw.

tion of my'time-limit device', I haveshown lit vjap led'to an automatic circuitbre'aker of fwe l-'known construction, the accompanying' drawin being a' front elevation of the same, Partly m section;

-, ger A4 is connected ably by means of-thef'pivoted links 5 6', which 1`Theoverload-coil1has thou al atmaturei 21controlling the ,tripping-latc napkin-"-V t thearmature, preer"" vss slips oithe' arm. This provides for a small To illustrate-the construction and opera-"f1 andi-operating tohold the dash-pot and having a screw-cover 14 to limit then Ward play offtheplungerg- In lthe ash-pot is aimovable abutment',

vpreferably a blade 15, pivoted',preferably, on l the lower edge of a rib 10', extending entirely' l bladeis. an arm 16,l extendingiupwafdat v an angleunderthe lowenendofgthep ungen The the had@ has moved, apregtermined enga; lar distance, and .thus permitthef v'11111111 r to dro freely. by etting the plunger reston thl'edgefofth -arm' is se'minstrulcted thatftlielortion which' sustains the plunger willbe 'Wit rawn when l acms the 1i(1,5102 ofthe-receptacle. Onthe too This is readily;l acconip i" arm, so that the angularniovementf-o-.th-..

arm from its normal position will carry said edge out of line with the lunger and permit the latter to slip off. In t e drawing the arm is shown provided with a hole 1,7 large enough toY let the plunger pass through it,

and the plunger rests normally on the outer edge ot' the hole. The bottom of the Yreceptacle is 'concentric with the pivot of the blade, whose edge ts close to said bottoni. The dash-pot. is filled with liquid, such as oil or glycerin, and the flow of this liquid from one side of the dash-pot tothe other when the blade swings from right to left (in the drawing) is regulated by a screw 18, controlling a by-pass 19 preferably in the rib 10. The return movement of the blade to its normal position is .facilitated by a hole 20 in the blade controlled by a check-valve, such as the Hap-valve 21 on the front ofthe blade, which closes the hole when the blade swings from right to left, but opens freely when the blade returns.

The operation is as follows: The energizing of the overload-magnet pulls down the armature, which pushes down .the plunger, and thereby depresses the arm and swings the blade to the left. The resistance of the liquid causes the blade to move slowly, and thus retards the action of the tripping devices until the angular movement of the arm brings the hole fully under the plunger, which instantly slips through said hole and permits a sudden operation of the tripping mechanism.

In case it is desired to trip the breaker' by handthe rod 22, attached to the arm 9, is pulled down, which breaks the toggle and permits the armature to be depressed without actuating the plunger.

In accordance with the patent statutes I have described the principle of operation of my invention, together with the apparat-us which I novT consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other means.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. The combination with an automatic circuit-breaker, of a dash-pot having a pivoted abutment therein, means for connecting said abutment with the tripping mechanism of the breaker, and means for automatically disconnecting it after a definite time of movement.

2. The combination with an automatic circuit-breaker, of a dash-pot having a pivoted abutment therein, arm on said abutment, a plunger connected with the tripping mechanism of the breaker and bearing on said arm, and means permitting said plunger ping mechanism of said breaker and bearing on said arm adjacent to the edge thereof.

4. The combination with an automatically tripped circuit-controller, of a dash-pot comprising a receptacle having a curved bottom,

'a blade operatively connected to the tripping mechanism of said controller and pivotcd in said receptacle concentrically with said bottom, an arm on said blade, a by-pass, and a regulating-screw therefor.

5. The combination with an automaticallytripped circuit-controller, of a dash-pot coinprisinga receptacle having a curved bottom, a blade operatively connected tothe tripping mechanism of said controller and pivoted in said receptacle concentrically with said bottom and having a hole, a check-valve controlling said hole, an arm on the blade, and a plunger resting on the edge of said arin.

6. The combination with an automatic circuit-breaker, of a dash-pot, a plunger, and a toggle .ponnecting said plunger with the tripping mechanism of the breaker.

7'. The combination with an automaticcircuit-breaker, of a dash-pot, Va plunger, two links composing a toggle connecting said plunger with the tripping mechanism of the breaker, an arm on one of said links, and a spring and a. rod attached to said arm.

S. The combination with an automatic circuit-breaker, of a dash-pot, a plunger, two

links composing a toggle connecting said plunger with the tripping mechanism of the breaker, an arm on one ot' said links. a spring and a rod attached to said arm, and means for holding said toggle normali;Y extended.

9. The combination with an automatic circuit-controller. of a receptacle having a curved bottom, a lid having a rib extending across the entire width thereof, and contain- 'hand this 23d day of July, 1903.

IVII ALIAM B. POTTER.

Witnesses:

BENJAMIN B. Hrm., HELEN .Onronn IOO 

